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Shimano R203S/P Disc Brake Adaptor for 203mm Rotor 51mm Caliper 74mm Frame. Shimano Disc Brake Adaptors allow the use of different sized rotors to your frame or fork.
- TECH SPECS
| Brake Caliper Type | I.S. |
| Mount | Rotor Size | 180 Post | 203 Rotor |